A black start power equalization control method and system for energy storage

By identifying the characteristics of sudden changes in battery internal resistance and the polarization steady-state window, a real-time linkage mapping between droop slope and state of charge is established to dynamically compensate for nonlinear drift of internal resistance. This solves the problem of unbalanced power distribution in energy storage systems under black start and emergency conditions, and improves the stability and safety of the system.

CN122178411BActive Publication Date: 2026-08-14国网浙江省电力有限公司永嘉县供电公司 +1
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Patent Information

Application Number
CN202610652522.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-05-13
Publication Date
2026-08-14
Estimated Expiration
2046-05-13

AI Technical Summary

Technical Problem

Existing energy storage systems struggle to achieve balanced power distribution during black starts or emergency conditions, leading to equipment overload or underload, which affects system stability and safety. This is mainly because traditional control strategies cannot effectively identify and adapt to instantaneous fluctuations and drifts in battery internal resistance.

Method used

By collecting real-time charge data, terminal voltage drop rate, and polarization relaxation response time of the battery energy storage module, the inflection point of internal resistance change is identified, a polarization steady-state window is established, and the risk of droop slope oscillation is detected based on transient internal resistance sampling data. An internal resistance sampling stable range is established to achieve dynamic compensation and ensure accurate allocation of power output ratio.

Benefits of technology

It improves power balancing accuracy under black start and emergency conditions, avoids equipment overload risk caused by instantaneous fluctuations in internal resistance, and improves the system's operational stability and safety.

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Abstract

This invention relates to the field of power system energy storage technology, and particularly to a black-start power equalization control method and system for energy storage. The method includes identifying the internal resistance abrupt change inflection point of the battery energy storage module based on discharge depth segment distribution data, and determining the polarization steady-state window based on the internal resistance abrupt change inflection point; detecting the droop slope oscillation risk based on transient internal resistance sampling data and the polarization steady-state window, and determining the internal resistance sampling stability interval; after the flexible boost energy storage system enters the black-start operation mode, establishing a linkage mapping relationship between the real-time value of the droop slope and the real-time charge data based on the internal resistance sampling stability interval, dynamically compensating for the nonlinear drift of the internal resistance of each battery energy storage module, and obtaining the power output ratio of each battery energy storage module in the black-start operation mode. This invention improves the power distribution stability of the energy storage system under black-start and emergency conditions by dynamically identifying the internal resistance abrupt change inflection point and establishing a linkage mapping compensation between the droop slope and the charge.
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